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数据存储组件 · App Inventor 2 中文网
...文件名 前加上 / 来读取SD 卡上的特定文件（例如，/myFile.txt 将读取该文件 /sdcard/myFile.txt）。
读取应用程序打包的资源（也适用于AI伴侣)，文件名 以 //（两个斜杠）开始。
如果一个文件名 不以 / 开头，打包的应用程序...
Create a .txt file if doesn't exist, and if it does append a new line
I would like to create a .txt file and write to it, and if the file already exists I just want to append some more lines:
1...
How do I save a String to a text file using Java?
...ata, the following will work:
PrintWriter out = new PrintWriter("filename.txt");
Then, write your String to it, just like you would to any output stream:
out.println(text);
You'll need exception handling, as ever. Be sure to call out.close() when you've finished writing.
If you are using Java...
Reading a resource file from within jar
...tResourceAsStream:
InputStream in = getClass().getResourceAsStream("/file.txt");
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
As long as the file.txt resource is available on the classpath then this approach will work the same way regardless of whether the file.txt reso...
How to read a file into a variable in shell?
...atform, lowest-common-denominator sh you use:
#!/bin/sh
value=`cat config.txt`
echo "$value"
In bash or zsh, to read a whole file into a variable without invoking cat:
#!/bin/bash
value=$(<config.txt)
echo "$value"
Invoking cat in bash or zsh to slurp a file would be considered a Useless Us...
What is pip's equivalent of `npm install package --save-dev`?
...Best way is to pip install package && pip freeze > requirements.txt
You can see all the available options on their documentation page.
If it really bothers you, it wouldn't be too difficult to write a custom bash script (pips) that takes a -s argument and freezes to your requirements.tx...
How do I execute a program from Python? os.system fails due to spaces in path
...port subprocess
subprocess.call(['C:\\Temp\\a b c\\Notepad.exe', 'C:\\test.txt'])
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Easiest way to read from and write to files
...iting a text file:
using(StreamWriter writetext = new StreamWriter("write.txt"))
{
writetext.WriteLine("writing in text file");
}
Reading a text file:
using(StreamReader readtext = new StreamReader("readme.txt"))
{
string readText = readtext.ReadLine();
}
Notes:
You can use readtext.D...
sed or awk: delete n lines following a pattern
...attern (including the line with the pattern):
sed -e '/pattern/,+5d' file.txt
To delete 5 lines after a pattern (excluding the line with the pattern):
sed -e '/pattern/{n;N;N;N;N;d}' file.txt
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Select random lines from a file
...d it in 0.047 seconds
$ time ./powershuf.py -n 10 --file lines_78000000000.txt > /dev/null
./powershuf.py -n 10 --file lines_78000000000.txt > /dev/null 0.02s user 0.01s system 80% cpu 0.047 total
The reason it is so fast, well I don't read the whole file and just move the file pointer 10 ...